G20 trade ministers reaffirmed their commitment to free trade as a central driver of growth and to streamline the flow of goods through borders.

The ministers met in Sydney for the latest round of talks among the world's leading economies, with Australia's Trade Minister Andrew Robb saying all nations were still committed to the Bali agreement struck in December.

Robb said while some G20 members raised concerns about the deal, which streamlines the global flow of goods, "every country there at the meeting did reaffirm their commitment to all nine elements of the Bali agreement being completed".